It's $80 for a one year subscription, but networksims does have limited catalyst switch support. It all depends on the practice question it presents you with, but it'll support commands that aren't present in Packet Tracer.

You're best bet, to be honest, is to connect real catalyst switches to your GNS3 topology. That way you get the best of both worlds for free (short of the price of a real switch, which are dirt cheap these days).

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